We actually use three sizes of gravel when installing gravel roads. The first layer of gravel pavers should consist of baseball size rocks, which are often called #3 Gravel Stone have used many applications in construction. These rocks form a strong foundation for your driveway and ensure good drainage keep water away from your foundation. This foundation layer also keeps the smaller rock from disappearing into the soil and prevent the spread of gravel. You’ll install approximately a 4 inch layer of this aggregate of one or more minerals or rock. Once we start laying the gravel, before applying the next layer,we must compact each layer with a roll bending. All this if seems like a lot of work, consider hiring professional services. Installing a gravel driveway is a big task for the average homeowners, but a professional with the right equipment can complete the job in a few days than expected time.